Selection of signal grass clones for resistance to fall armyworm

• Autor(a) principal: Auad, Alexander Machado
• Data de Publicação: 2016
• Outros Autores: Souza Sobrinho, Fausto, Mendes, Simone Martins, Toledo, Antônio Marcos Oliveira, Lucindo, Thiago de Souza, Benites, Flávio Rodrigo Gantolfi
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Agropecuária Brasileira (Online)
• Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/20793
• topic: Spodoptera frugiperda; Urochloa ruziziensis; crop‑livestock‑forest integration; plant resistance; Spodoptera frugiperda; Urochloa ruziziensis; integração lavoura‑pecuária‑floresta; resistência de plantas

The objective of this work was to evaluate and select signal grass (Urochloa ruziziensis) clones resistant to fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), for use in a crop‑livestock‑forest integration system. One hundred and forty-seven clones of U. ruziziensis were evaluated in a completely randomized design with three replicates. An artificial diet, adequate for insect development, was used as a control and susceptibility standard. Leaves of different U. ruziziensis clones were collected and offered as food to the insects, kept individually in rearing units. Larval survival, duration, and biomass of larvae and pupa were evaluated. Significant differences were observed between clones for all evaluated traits, showing the marked effect of U. ruziziensis clones on the development of S. frugiperda. Twenty clones were identified in which there was no development of larvae and 55 clones in which there was an average larval survival of 33%. For the other clones, which were better hosts, insect development was affected by the longer larval stage and by the reduction in pupa biomass. The obtained results show the potential of using Urochloa ruziziensis clones for the reduction of Spodoptera frugiperda populations in a crop‑livestock‑forest integration system.